Include Python.h, not allobjects.h (which no longer exists).
diff --git a/PC/import_nt.c b/PC/import_nt.c
index d34033c..e340bb9 100644
--- a/PC/import_nt.c
+++ b/PC/import_nt.c
@@ -6,7 +6,7 @@
 
 */
 
-#include "allobjects.h"
+#include "Python.h"
 #include "osdefs.h"
 #include <windows.h>
 #include "importdl.h"